const a = "10"
let b = 20
b = 30;
const obj = {
    name:"admin",
    age:18,
    sex:"男"
}
const {sex,age,name} = obj

class Test{
    constructor(n){
        this.name = n
    }
    show(){
        console.log(this.name)
    }
}

class T extends Test{
    constructor(n){
        super(n)
    }
}

const t = new T("张三")
t.show();

(function(){
    console.log("hello")
})();

